Infiltração gordurosa nos mm. multífidus e psoas maior em função do tipo de alteração discal em pacientes com lombalgia: um estudo através de imagens de ressonância magnética / Fat infiltration in multifidi and psoas major muscles according to disc pathology in low back pain patients: a magnetic resonance imaging study

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Low back pain patients present atrophy on muscles responsible for spine stabilization. However, it is not clear if muscle waste is related to the cause or if it is a consequence of this disfunction. Nor it is clear if muscle athophy is affected by the type of disc pathology. This study tested the hypothesis that muscle waste in low back pain patients influenced by the type of disc derangement. Magnetic resonance scans of 78 low back pain patients were randomly analysed. Cross sectional area percentage of fat tissue in multifidi and psoas major muscles was measured on the lower levels of the lumbar spine. Disc pathology was found in 95% of the exams and disc bulge was the most frequent abnormality, followed by disc protrusion. Fat percentage varied according to disc pathology and this difference was statistically significant. Muscles on levels with disc bulge presented 6% more fat deposits than muscles on levels with disc protrusion. Muscles on levels with discs without anular tear present more fat infiltration than muscles on levels with anular tear. Fat percentage was also influenced by anatomic aspects such as evaluated muscle and spine level, and sample characteristics as age and sex. The results indicated that muscle atrophy in low back pain patients is not a uniform and generalized feature. It is correlated to different variables, such as type of disc pathology

ASSUNTO(S)

magnetic resonance imaging/methods low back pain/complications muscular atrophy deslocamento do disco intervertebral atrofia muscular imagem por ressonância magnética/métodos intervertebral disk displacement dor lombar/complicações

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